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Step * of Lemma length_append

∀[as,bs:Top List].  (||as @ bs|| = (||as|| + ||bs||) ∈ ℤ)
BY
{ (RWO "length-append" 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[as,bs:Top  List].    (||as  @  bs||  =  (||as||  +  ||bs||))


By

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Latex:
(RWO  "length-append"  0  THEN  Auto)

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